This is the Optional Aluminum Idler Gear for many Traxxas Vehicles. This idler gear works on these Traxxas vehicles as of the date of writing. Bandit Rad 2 Rustler Stampede Nitro Street SRT Nitro Buggy Nitro Hawk Hawk 2 Blue Eagle LS/LSII FEATURES: Machined aluminum 30T idler gear Hard anodized INCLUDES: One Auminum Idler Gear REQUIRES: Two 5 x 11mm bearings (DTXC1547) One #3195X top drive gear (TRAC3296) COMMENTS: This idler gear is not for use with the original steel top gear #3195 (per Traxxas). Use the top drive gear listed in REQUIRES. snew 07/02/00 ir/jl